Removal of CO from reformed fuels by selective methanation over Ni-B-Zr-Oδ catalysts

The Ni-B-O-delta and Ni-B-Zr-O-delta catalysts were prepared by the method of chemical reduction. and the deep removal of CO by selective methanation from the reformed fuels was performed over the as-prepared catalysts. The results showed that zirconium Strongly influenced the activity and selectivity of the Ni-B-Zr-O-delta catalysts. Over the Ni-B-O-delta catalyst, the highest CO conversion obtained was only 24.32% under the experimental conditions studied. However, over the Ni-B-Zr-O-delta catalysts, the CO methanation conversion was higher than 90% when the temperature was increased to 220 degrees C. Additionally, it was found that the Ni/B mole ratio also affected the performance of the Ni-B-Zr-O-delta catalysts. With the increase of the Ni/B mole ratio from 1.8 to 2.2, the CO methanation activity of the catalyst was improved. But when the Ni/B mole ratio was higher than 2.2, the performance of the catalyst for CO selective methanation decreased instead. Among all the catalysts, the Ni29B13Zr58O delta catalyst investigated here exhibited the highest catalytic performance for the CO selective methanation. which was capable of reducing the CO outlet concentration to less than 40 ppm from the feed gases stream in the temperature range of 230-250 degrees C. while the CO2 conversion was, kept below 8% all along. Characterization of the Ni-B-O-delta and Ni-B-Zr-O-delta catalysts was provided by XRD, SEM, DSC, and XPS.